| Re: Does Space really go on forever?
The usual analogy is with the surface of the Earth. The surface of the earth goes on forever but it is finite.
The surface of the Earth is two dimensional but unbounded because it curves around a three dimensional sphere so one could travel in any direction across the surface of the earth forever without encountering an edge.
Similarly space is three dimensional but unbounded because it curves around a four dimensional "hypersphere" so one could travel in any direction through space forever without encountering an edge. (actually that's a simplification space is assumed to curve in all sorts of bizarre ways according to what's in it as stuff like black holes and so on deform space and it probably curves in about 11 dimensions but the analogy is good) |